Converting to B-Vent unit heater for garage


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Old 02-12-19, 12:23 PM
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Converting to B-Vent unit heater for garage

Hello,
I bought a house that came with a very old home furnace sitting on the floor in the garage and was using a standard vent out the roof. Well, this furnace is dead and I am replacing it with a ceiling mounted gas unit heater. It is a Reznor V3 T Core 2. This heater requires a b-vent, is there any way I can tie into the existing vent at all or do I have to punch a new hole in the side of the house to vent this one? Thanks!
 
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Old 02-12-19, 12:57 PM
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This heater requires a b-vent,
Are you sure about that ?

It looks like to me like that heater requires a direct vent pipe not a b-vent.
A "b" vent is a single flue line that always goes up.
A direct vent uses concentric pipe..... fresh air in and exhaust out..... and can be installed horizontally or vertically. The advantage to using the direct vent is increased efficiency from using outside air for combustion.
 
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Old 02-12-19, 01:29 PM
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Oh OK, You are probably right, I just assumed it needed a b-vent.... so then do you think it is worth tying into the existing exhaust pipe or should I just punch a new hole and vent horizontally?
 
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Old 02-12-19, 01:34 PM
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In order for you to keep your insurance in effect you must install the heater to code and the mfr's recommendations.

The installation manual will tell you exactly what is required.
 
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Old 02-12-19, 01:49 PM
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Agreed! I don't have the heater in my possession yet, was looking at buying it off a guy and was trying to get some advance info on whether or not it would work for me....
 
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Old 02-12-19, 03:58 PM
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The heater requires concentric or direct vent pipe. It can go directly thru the wall.
Reznor and others offer kits for the end of the pipe. Some of them can be a little pricey.
 
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Old 02-13-19, 08:12 AM
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Ok - thanks! I bought the heater, it came with the vent pipe and end cap, so I suppose I will just cut a new hole in the side of the garage and abandon the old vent that goes through the roof...
 
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Old 02-17-19, 08:24 AM
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It is a power vent with with a 4 inch. The existing vent in the garage is a 5 inch single wall the goes straight up through roof, which used to be connected to an old furnace. Can I run the new direct vent pipe up inside the existing 5 inch?
 
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Old 02-17-19, 10:37 AM
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Yes.... you can run the 4" direct vent all the way thru the 5" B vent line.
You'll still need the proper cap for the 4" line.
 
 

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